7k[ACROCnLAMYS. 



127 



This radula is very different from tliat of typical Macrocldamys, 

 and so is the genitalia, and if it should be common to all the 

 Andaman species it would constitute them a good subsection ._ 



Aculeate laterals have been noticed in the following species : — 

 M. laimana ; M. castaneo-Jahi ata ; in M. tngurium the outermost 

 teetii ; and in M. dalingensis they are nearly aculeate.] 



202 Macrochlamys stephus, Bs. (Helix) A. M. N. II. (3) vii, 1861, 

 p. 84 ; lYr. (Helix) Mon. Hel. v, 1868, p. lOo ; 'f H. S> T. (Helix) 

 C. I. 1876, pi. 62, tigs. 4, 5, 6 ; Nevill, Xanina (Macrochlamys), 

 liand-l i, 1878, p. 2^ ; Go(hvm-Austen, A. M. N. II. (6) ii, 1888, 

 p. 56; id. P. Z. S. 1895, i)p. 441, 446; id. Mol. Lid. ii, 1898, 

 p. 50. 

 Shell narrowly perforate, depressed, smooth, with faint micro- 

 scopic traces of minute, close, spiral (longitudinal) striation, poHshed, 

 pale yellowish or greyish brown ; spire very depressedly conoidal, 

 suture faintly impressed ; whorls G-7, slightly convex above, in- 

 creasing slowly and regularly, the last rounded outside, obtusely 

 subangniate above the periphery in immature shells, convex 

 beneath ; aperture slightly oblique, lunate ; peristome tbin, upper 

 margin straight, basal slightly arcuate, columellar oblitiue, ex- 

 panded throughout the greater part of its length, more broadly 



above. ... 



Major diain. 12|, min. 11, height nearly 6 mm. A rather 

 smaller specimen with 6 whorls measures 11| X lO-i x5 mm. 



Hab. Mount Harriet, Port Blair, South Andaman Island. 



Benson's type measured only 10 mm. in major diameter. 



The figures in the ' Conchologia Indica ' are not good, and per- 

 haps represent a different shell. 31. stephus may be recognized 

 by its closely-wound whorls, low spire, and want of distinct 

 sculpture under the microscope. 



Animal throughout yellow, except the tentacles, which are 

 black, sole of foot also yellow {Nevill). 



[In a specimen recently examined, sent home by Mr. G. Rogers 

 from South Andaman Island, a minute left shell-lobe is present, 

 contracted and hooked in the spirit-specimen. Preserved in this 

 way and brittle, it would very readily be broken off. _ The penis 

 has a small coiled ctecum ; the jaw a small central projection. In 

 the radula the laterals are slightly curved aculeate teeth, and the 



formula is 



30 . 1 . 10 . 1 . 10 . 1 . 30 



41 . 1 . 41 



in all respects similar to that of M. exul.'] 



*203. Macrochlamys woodmasoni, Godinn-Austen(Nevill,MS.),Mol. 

 Lid. i, 1888, p. 209, pi. 53, fig. 2. 

 Maf-rochlamys woodmasoniana, Godioin-Austen, P. Z. S. 1895, 

 pp. 441, 446. 

 " Shell not quite mature, perforation minute, very depressedly 



